2017-07-25 14:17:57 +00:00
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package main
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import (
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"flag"
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"fmt"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/prometheus/common/log"
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)
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var (
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2019-02-15 10:33:15 +00:00
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configFile = flag.String(
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2017-07-25 14:17:57 +00:00
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"config.file", "ipmi.yml",
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"Path to configuration file.",
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)
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executablesPath = flag.String(
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"path", "",
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"Path to FreeIPMI executables (default: rely on $PATH).",
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)
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listenAddress = flag.String(
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"web.listen-address", ":9290",
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"Address to listen on for web interface and telemetry.",
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)
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sc = &SafeConfig{
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C: &Config{},
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}
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reloadCh chan chan error
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)
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2018-09-21 09:41:59 +00:00
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func remoteIPMIHandler(w http.ResponseWriter, r *http.Request) {
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2017-07-25 14:17:57 +00:00
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target := r.URL.Query().Get("target")
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if target == "" {
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http.Error(w, "'target' parameter must be specified", 400)
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return
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}
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log.Debugf("Scraping target '%s'", target)
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registry := prometheus.NewRegistry()
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2018-08-03 14:23:35 +00:00
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remoteCollector := collector{target: target, config: sc}
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registry.MustRegister(remoteCollector)
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2017-07-25 14:17:57 +00:00
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h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
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h.ServeHTTP(w, r)
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}
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func updateConfiguration(w http.ResponseWriter, r *http.Request) {
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switch r.Method {
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case "POST":
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rc := make(chan error)
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reloadCh <- rc
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if err := <-rc; err != nil {
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http.Error(w, fmt.Sprintf("failed to reload config: %s", err), http.StatusInternalServerError)
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}
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default:
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2018-08-10 15:42:19 +00:00
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log.Errorf("Only POST requests allowed for %s", r.URL)
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w.Header().Set("Allow", "POST")
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http.Error(w, "Only POST requests allowed", http.StatusMethodNotAllowed)
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2017-07-25 14:17:57 +00:00
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}
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}
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func main() {
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flag.Parse()
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log.Infoln("Starting ipmi_exporter")
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// Bail early if the config is bad.
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if err := sc.ReloadConfig(*configFile); err != nil {
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log.Fatalf("Error parsing config file: %s", err)
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}
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hup := make(chan os.Signal)
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reloadCh = make(chan chan error)
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signal.Notify(hup, syscall.SIGHUP)
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go func() {
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for {
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select {
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case <-hup:
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if err := sc.ReloadConfig(*configFile); err != nil {
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log.Errorf("Error reloading config: %s", err)
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}
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case rc := <-reloadCh:
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if err := sc.ReloadConfig(*configFile); err != nil {
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log.Errorf("Error reloading config: %s", err)
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rc <- err
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} else {
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rc <- nil
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}
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}
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}
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}()
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2018-08-03 14:23:35 +00:00
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localCollector := collector{target: targetLocal, config: sc}
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prometheus.MustRegister(&localCollector)
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http.Handle("/metrics", promhttp.Handler()) // Regular metrics endpoint for local IPMI metrics.
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2018-09-21 09:41:59 +00:00
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http.HandleFunc("/ipmi", remoteIPMIHandler) // Endpoint to do IPMI scrapes.
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2017-07-25 14:17:57 +00:00
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http.HandleFunc("/-/reload", updateConfiguration) // Endpoint to reload configuration.
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte(`<html>
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<head>
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<title>IPMI Exporter</title>
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<style>
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label{
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display:inline-block;
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width:75px;
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}
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form label {
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margin: 10px;
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}
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form input {
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margin: 10px;
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}
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</style>
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</head>
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<body>
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<h1>IPMI Exporter</h1>
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<form action="/ipmi">
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<label>Target:</label> <input type="text" name="target" placeholder="X.X.X.X" value="1.2.3.4"><br>
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<input type="submit" value="Submit">
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2018-08-03 14:23:35 +00:00
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</form>
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<p><a href="/metrics">Local metrics</a></p>
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<p><a href="/config">Config</a></p>
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2017-07-25 14:17:57 +00:00
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</body>
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</html>`))
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})
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log.Infof("Listening on %s", *listenAddress)
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err := http.ListenAndServe(*listenAddress, nil)
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if err != nil {
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log.Fatal(err)
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}
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}
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